All the crystal molecular structures of c1, c2, c4 and c5 belong to monoclinic system and only one molecular unit were observed, although these compounds have different types and positions of substituents in the phenoxymethyl unit.

hornblende, muscovite (monoclinic) and plagioclase (triclinic), [100] [010] and [001] directions do not correspond to the pole of the respective crystallographic plane (100) (010) (001), except for [010] in the monoclinic system.

In addition, to facilitate the use of these conventions, Volume A of the International Tables for Crystallography has been expanded to give explicitly the required space group settings in the monoclinic system (e.

Skipping over the technical discussions of the isometric, tetragonal and monoclinic systems, I headed straight to the "Catalogue of American Localities of Minerals," where Dana listed many of our Bay State communities and the geologic treasures they hold.

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